mr_test: Fix cleanupMR()
mr_test: Fix cleanupMR()

The cleanupMR() function doesn't work when calling "sh -c".  It should
just call the executables directly.

Fix the cleanupMR() to call executables directly.

Signed-off-by: Prarit Bhargava <fe4655370dc87a32329d591d6e8472329333dfad@redhat.com>

zaquestion/lab,zaquestion/lab